Power-hammer and rock-drill



No. 749,996. PATENTED JAN.19,91994.

LKRAUS.

POWER HAMMER AND ROCK DRILL.

` APPLIOATION FILED MAY 21, 190s.

1510 MoEL. a SHEETS-SHEET 1.

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APPmATroN rILDD MAY 21.` 1903.

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'H Il No. 749,996. Y J. KRAU-S. 4'

POWER'HAMMER AND 'ROCK DRILL. ArPLIoATIoN FILED um` 21. 190s. uo nonni.. f' Y s SHEETS-snm a.

UNITED STATES V:Patented January 19, 1904.

PATENT OEEICE.-

POWER-HAMMER AND BooK-DRILL.

SPECIFICATION forming part of Letters Patent No. 749,996, dated January 19, 1904.

Applicationled May 21, 1903.

To all whom it may concern.-

dent of Cuyahoga Falls, in the county'of Summit and Stateof Ohio, -have invented a new and useful Improvement in Power-Hammers and Rock-Drills; and I do hereby declare the following to be a full, clear, and `exact description thereof.

My inventionrelates to drilling and hammering machines such as may be used for stone or coal cutting, drilling and boring, and for analogous uses. Y v

The invention relates especially to that type of machine wherein there is a rotary shaft having hinged thereto a series of radially-'disposed hammers which in the rotation of the shaft strike the drill-holder` or anvil to perform the work. This type of drilling and hammering machine is not new per se, and my invention relates to improvements therein whereby the machine is rendered simpler in construction and more reliable and efiicient in operation.

In the accompanying drawings, Figure lis a side View of my invention, showing the same applied as a stone or coal drillingmachine. Fig. 2 is a plan view of the same. Fig. 3 is a side view of the operating mechanism on an enlarged scale. Fig. 4 is a horizontal transverse section through the same, and Fig. `5 is a detail showing the manner of applying the motor thereto.

In the drawings I have shown my invention applied to a vertical stone or rock drilling machine; but the invention is not entirely limited thereto, as certain parts thereof may be applied to hammering-machines for general use. The invention is also shown as particsaid shaft is secured a gear-wheel 5, which is driven from a pinion 6. The latter may be the armature-pinion of an electric motor or Serial No. 158,126. (No model.)

` i the driving-pinion of anyother type of motor. Be it known that I, J ULIUs KRAUs, a resi- In the drawings it is shown as vthe armaturepinion of an electric motor, the latter being shown at'7 secured to fthe back side of the Icasing 1, as shown in Fig. 5. This fastening comprises suitableiianges 8, formed on the lcasing land into which the motor-casing 7 fits. Inthis manner an electric motor of suficient power to operate the drill may benonnected directly to the casing, thus facilitating the movement of the apparatus from placetov 1 place, no connection for the apparatus being necessary except the electric "mains leading to the motor.

The hammers are shown at 10, two such hammers being used in the particular machine illustrated; but it will be evident that either one or more thanl two may be employed, if desired.v These hammers are provided with helves l1, which are suitably hinged to the shaft 4, and for simplicity in construction it By the rotation of the gearv `is preferable to hinge them directly to the will strike to do the work andwill slide'off the same in the well-understood manner. The anvil or head 13 of the drill-holder is connected to a suitable shank 14, passing through an opening in `a vprojection `15, formed integrally with or suitably secured to the casing 1. At its lower end this projection `carries a suitable chuck or clamp 15 for holding the drill 16, and said drill-holder is normally held elevated or retracted by means of a spiral spring 17 interposed between a shoulder 18 on the shank 14 and aA collar 19, secured to the lower end of the projection 15. A

In the Working of rock-drills it is necessary IOO to rotate the drill after each blow or succession of blows. As a simple means for doing this the head or anvil 13 of the drill-holder is provided with a series of ratchet-teeth 20 on its periphery. These are engaged by a reciprocating pawl 21, slidably mounted in bearings 22 and having connected thereto one end of a lever 23, fulcrumed at 24 to the casing, and having its other end lying in the path of a cam 25. This cam will be of any suitable shape to actuate the lever 23 and pawl 21 at the proper time, and when two hammers are employed, as illustrated, the cam will be elliptical in shape, but the shape will necessarily vary, according to the number of hammers employed. For simplicity of construction the cam 25 is formed directly on the hub of the gear-wheel 5 in casting the latter, thus dispensing with an additional part to form said cam. A spiral spring 27 has one end connected to the inner end of the sliding pawl 21 and its opposite end secured to a stationary part of the casing 1, said spring acting normally to retract the pawl 21, so as to enable it to engage another ratchet-tooth 20 on its next outward movement by means of cam 25 and lever 23.

With stone-drills it is also necessary, or at least desirable, to supply water to the drill. As a convenient means for doing this I make the drill hollow-that is, provide it with an opening or duct 30, which communicates with a suitable duct 31 on the drill-holder 15, and this duct leads out to the side oi' said drillholder at 32, from whence leads a pipe 33 to the discharge-opening 34 of a pump 35, the latter having an inlet-opening at its lower end at 36, which is connected by a suitable pipe or tube to any source of water-supply. The pump 35 may be of any type and is secured to the casing 1 so as to project radially therefrom. The piston is shown at 36, and this reciprocates vertically, being actuated by means of a connecting-rod 37, secured thereto and attached at its upper end to a crank 38 on the outer end oi' the shaft 4.

The drill is supported from a suitable tripod 40, as shown in Figs. 1 and 2, and in order to permit the feeding of the drill I connect to the tripod 40 a vertical guide frame or way 41, which is engaged by a projecting portion 42 of the frame or casing 1 of the drill. A feed-screw 43 is journaled in the guideway 41 and engages the projection 42, this Jfeedscrew being provided at its upper end with a suitable handle 44, whereby it can be rotated, thus feeding the drill downwardly as required.

The operation of the apparatus will be readily understood from the foregoing description. The operation of the motor 7 rotates the gear-wheel 5, and this carries the hammers 10 around so that they strike in succession upon the drill-head or anvil 13, then sliding olil the same by reason of their pivotal connections at 12 to the gear-wheel 5. Each blow of the hammers causes the drill to be forced downwardly, said drill being raised between the blows by the spiral spring 17. The rotation of the wheel 5 through the cam 25 oscillates the lever 23, thus operating the sliding pawl 21 and rotating the drill inthe intervals between the blows. The pump 35 is also operated directly from the shaft 4, thus supplying water to the drill. As the drilling progresses the operator will turn the screw 43, thus feeding the drill downwardly.

The drill shown and described is very compact and simple, the number of parts being reduced to a minimum, thus rendering the operation of the apparatus very efficient and reliable. Furthermore, the mounting of the motor directly on the casing enables the apparatus to be moved about with facility, as the electric mains leading to the motor offer practically no obstruction in moving the apparatus. By this reason the drill is capable of very wide use and in places where ordinarily it is diiiicult to place a rock-drill.

By merely substituting a stationary anvil for the head 13 of the drill my apparatus may be used for ordinary blacksmith-hammering or the like, and certain features of the invention are intended to have this use and not to be limited entirely to use as a stone-drill.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a hammering-machine, the combination with a frame or casing, a motor-driven pinion mounted in said machine, a gear with which said pinion meshes, one or more hammers provided with arms which are pivotally connected directly to said gear, and an anvil or the like in line with the hammers when in their outermost positions.

2. In a hammering-machine, the combination with a frame or casing, of a gear mounted to rotate in said frame or casing, means for rotating said gear, one or more hammers provided with arms which are hinged directly to said gear, and an anvil or the like in line with said hammers when in their outermost positions.

3. In a drilling-machine, the combination with a frame or casing, of a gear rotatably mounted in said frame or casing, means for rotating said gears, one or more hammers provided with arms hinged directly to said gear,

.a drill-holder in line with the hammers when in their outermost positions, aratchet on said drill-holder, a pawl for engaging said ratchet, and a cam formed on said gear for actuating' said pawl.

4. In a hammering-machine, the combination with a frame or casing, of a rotating gear mounted in said casing, an electric motor mounted on said casing and having its armature-pinion meshing' with said gear, one or more hammers provided with arms pivotally IOO IIO

connected directly to said gear, and an anvil or the like in line with the hammers when in their outermost positions.

5. In a drilling-machine, the combination With a circular frame or casing, a rotating shaft mounted centrally therein, one or more hammers provided with arms hinged to said shaft, a drill-holder mounted in a tangentiallyprojecting hollow portion of said easing, a

I0' pump rigidly secured to said casing, an operating-rod for said pump actuated from said rotating shaft, and rigid pipe connections from said pump to the hollow tangentiallyprojecting portion of the casing.

In testimony whereof I, the said JULIUS I5 KRAUS, have hereunto set my hand.

JU LIUS KRAUS. Witnesses: Y

GEO. C. TIFFT, J. B. MERRIMAN. 

